github.com/fzfile/BaiduPCS-Go@v0.0.0-20200606205115-4408961cf336/requester/rio/multi.go (about)

     1  package rio
     2  
     3  import (
     4  	"io"
     5  )
     6  
     7  // MultiReaderLen 合并多个ReaderLen
     8  func MultiReaderLen(readerLens ...ReaderLen) ReaderLen {
     9  	// TODO: 和copy对比
    10  	r := make([]io.Reader, 0, len(readerLens))
    11  	for k := range readerLens {
    12  		if readerLens[k] == nil {
    13  			continue
    14  		}
    15  		r = append(r, readerLens[k])
    16  	}
    17  	return &multiReaderLen{
    18  		mrls:        readerLens,
    19  		multiReader: io.MultiReader(r...),
    20  	}
    21  }
    22  
    23  type multiReaderLen struct {
    24  	mrls        []ReaderLen
    25  	multiReader io.Reader
    26  }
    27  
    28  func (mrl *multiReaderLen) Read(p []byte) (n int, err error) {
    29  	return mrl.multiReader.Read(p)
    30  }
    31  
    32  func (mrl *multiReaderLen) Len() int {
    33  	var i int
    34  	for k := range mrl.mrls {
    35  		i += mrl.mrls[k].Len()
    36  	}
    37  	return i
    38  }
    39  
    40  // MultiReaderLen64 合并多个ReaderLen64
    41  func MultiReaderLen64(readerLen64s ...ReaderLen64) ReaderLen64 {
    42  	// TODO: 和copy对比
    43  	r := make([]io.Reader, 0, len(readerLen64s))
    44  	for k := range readerLen64s {
    45  		if readerLen64s[k] == nil {
    46  			continue
    47  		}
    48  		r = append(r, readerLen64s[k])
    49  	}
    50  	return &multiReaderLen64{
    51  		mrl64s:      readerLen64s,
    52  		multiReader: io.MultiReader(r...),
    53  	}
    54  }
    55  
    56  type multiReaderLen64 struct {
    57  	mrl64s      []ReaderLen64
    58  	multiReader io.Reader
    59  }
    60  
    61  func (mrl64 *multiReaderLen64) Read(p []byte) (n int, err error) {
    62  	return mrl64.multiReader.Read(p)
    63  }
    64  
    65  func (mrl64 *multiReaderLen64) Len() int64 {
    66  	var l int64
    67  	for k := range mrl64.mrl64s {
    68  		l += mrl64.mrl64s[k].Len()
    69  	}
    70  	return l
    71  }